Gold and silver: The states’ new currency?

From Csmonitor.com: States aren’t allowed to coin money. They can issue gold and silver, though, and some are talking about actually doing it. Why are so many state legislators beginning to call for issuance of a form of gold money?
The Constitution prohibits states from coining money but allows them to make “gold and silver Coin a Tender in Payment of Debts.” By prohibiting everything except “gold and silver Coin” the Constitution clearly considers gold and silver coinage to be legitimate, no matter who issues it…………………………………….Full Article: Source